External review is also called review, and it is also the most critical link in periodical review, and the pass rate is naturally strictly controlled. It can be said that the pass rate of external review is the lowest in all aspects of periodical review, and the rejection rate is relatively high, while other preliminary and final reviews are relatively easy to pass.

It is a little more difficult to pass the external review, because the external review is conducted by experts outside the journal, who are not insiders of the magazine, and the review is more objective and fair. External review is the key review of the core content of the article, and external review experts need to reach an agreement on the article.